Problem: Consider a 0.10 M solution of a weak polyprotic acid (H2 A) with the possible values of Ka1  and Ka2  given below. Calculate the contributions to [H3O+] from each ionization step.Ka1  = 1.0x10 - 4 ; Ka2  = 5.0x10 - 5

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 We are being asked to calculate the contributions to [H3O+] from each ionization step in H2A.

H2A

can donate two protons (H+) → diprotic acid
two equilibrium equations → two equilibrium constants
Equilibrium constants (Ka) given:

Ka1 = 1.0x10-4

Ka2 = 5.0x10-5


Construct an ICE Chart for the 1st equilibrium reaction:

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Problem Details

Consider a 0.10 M solution of a weak polyprotic acid (H2 A) with the possible values of Ka1  and Ka2  given below. Calculate the contributions to [H3O+] from each ionization step.

Ka1  = 1.0x10 - 4 ; Ka2  = 5.0x10 - 5